1988 Chev 4.3 6cyl.auto. Ran O.k......parked It & Next Day Won't Start ....battery Volts Fine...pos. & Neg. Fine.....fuses Fine...tried Moving Shifter To Neutral To Start & No Start No Clicks..removed Starter & Applied Power Directly & It Runs...put Back & No Click No Run No Start..what Do I Check For Now???

 

You need to find out if your getting somewhere near 12 volts to the small terminal at the starter when the key is in "start" position. You could have a bad ignition switch or the wiring from there to the starter.